put_object_stream reads stream to determine it's size

[annmuor]

Describe the bug
When using async put_object_stream I assume that the stream will be readed part by part as in async mode, but in reality it reads the whole stream to determine the size first. For large files it leads to OOM errors.

To Reproduce

let (mut rx, mut tx) = tokio::io::duplex(65535); // tokio duplex
tokio::spawn(async move { loop  { tx.write_all(&[1,3,4,5,6]).await; } });
Bucket::put_object_stream(b, &mut rx, "/123.txt").await;

Expected behavior
Memory is not overflowing, data is written as you go.

Environment

• Rust version: 1.69
• lib version 0.33.0

Additional context

[robinfriedli]

This seems to be covered by #346